Answer:
I can’t answer all of them, but I’ll answer the oxygen ones.
The mitochondria uses oxygen. In mitochondria, this process uses oxygen as a waste product. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell.
I hope this helps, even though I only answered 3 of your questions!!
Leafs do photosythesis because leafs absorb blue and red light and reflect green just an aditional fact for ya
In competition, males use feather color to warn potential rivals that they occupy a piece of territory.
